2021-2024 Nissan ICC Inoperative with DTC C1A16 or C2582

Owners of 2021-2024 Nissan vehicles, including the Nissan Sentra, may experience problems with their Intelligent Cruise Control (ICC) system, accompanied by specific warning lights or messages. This technical service bulletin (TSB) NTB19-033G provides a comprehensive diagnostic and repair procedure for these conditions.

Symptoms

If you own a 2021-2024 Nissan and are experiencing a Nissan Sentra ICC inoperative condition, you might notice one or more of the following:

• The Intelligent Cruise Control (ICC) system stops working while driving.
• The Automatic Emergency Braking (AEB) or Forward Emergency Braking (FEB) warning light is illuminated on the dashboard.
• Messages such as "Unavailable Front Radar Obstruction" or "Forward Driving Aids Temporarily Disabled Front Sensor Blocked See Owner's Manual" are displayed.

These symptoms are typically accompanied by specific diagnostic trouble codes (DTCs) stored in the vehicle's system.

Fault Codes / DTCs

This TSB specifically applies when one of the following DTCs is the only code stored in your vehicle's system:

Code	Description
C1A16	Intelligent Cruise Control / AEB/FEB System Fault
C1A16-97	Intelligent Cruise Control / AEB/FEB System Fault
C2582	Intelligent Cruise Control / AEB/FEB System Fault
C2582-97	Intelligent Cruise Control / AEB/FEB System Fault

Diagnosis and Trigger Conditions

Diagnosing the root cause of the Intelligent Cruise Control issue involves a series of checks outlined in the TSB's flow chart. Technicians will first confirm that one of the specified DTCs (C1A16, C1A16-97, C2582, or C2582-97) is the only code present. If other DTCs are stored, this bulletin does not apply.

Further diagnostic steps include:

• Obstruction Check: Inspecting the ICC distance sensor, located on the bumper fascia, for any physical obstructions such as bugs, dirt, mud, slush, or ice. Removing these can often resolve the issue.
• Weather Conditions: Determining if the problem occurs exclusively during adverse weather conditions (rain, sleet, snow, slush). If so, the sensor should not be immediately replaced.
• Repeated Incidents: Verifying if the incident occurs repeatedly over multiple driving trips. Intermittent issues may require different diagnostic approaches.
• Sensor Manufacturing Date: Locating and decoding the manufacturing date code on the ICC distance sensor. The TSB specifies that sensors manufactured before September 1, 2018 (01.09.2018) are more likely to be the cause of the problem.

Important Warnings for Owners

Nissan emphasizes that this bulletin is intended for qualified technicians, not for 'do-it-yourselfers'. There are several critical warnings:

• Do not immediately replace the distance sensor without following the full diagnostic procedure. Incorrect diagnosis can lead to unnecessary part replacement.
• If the incident only occurs during bad weather or if the distance sensor is obstructed, replacement of the sensor is typically not the solution.
• For warranty claims, the Flat Rate Time (FRT) for sensor replacement includes all necessary wheel alignment. Do NOT claim a separate alignment operation code with this claim.

Repair Procedure Summary

If the diagnostic steps confirm that the ICC distance sensor is the likely cause, particularly if it was manufactured before September 1, 2018, the repair involves replacing the sensor. The high-level steps are:

1. Initial DTC Check: Confirm only C1A16 or C2582 series DTCs are present.
2. Obstruction Removal: Clear any obstructions from the ICC distance sensor.
3. Condition Assessment: Evaluate if the issue is weather-dependent or consistently repeatable.
4. Sensor Date Check: Determine the manufacturing date of the existing ICC distance sensor.
5. Sensor Replacement: If the sensor's manufacturing date is before 01.09.2018, the ICC distance sensor will be replaced. Technicians must refer to the Electronic Service Manual (ESM) for specific removal and installation instructions, including the precise torque sequence for the sensor's nuts and bolts.
6. Sensor Alignment: After replacement, a distance sensor alignment procedure must be performed to ensure proper system calibration. This is a crucial step for the correct functioning of the ICC and AEB/FEB systems.

Required Tools or Parts

The primary part required for this repair is the SENSOR UNIT-DISTANCE (ICC Distance Sensor). Technicians will refer to the Electronic Parts Catalog (EPC) to obtain the correct part number for the specific vehicle model.

Owner Action

If your 2021-2024 Nissan, including a Nissan Sentra, exhibits any of the described symptoms or stores DTC C1A16 or C2582, it is recommended to schedule an appointment with an authorized Nissan dealer. The dealer's qualified technicians will follow the diagnostic procedure outlined in TSB NTB19-033G to accurately identify and resolve the issue. This repair is typically covered under warranty if your vehicle meets the specified conditions and is within the warranty period.